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Mystery of Amazon fertile soils unlocked


Eldorado

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Phosphorous, calcium and charcoal suggest that indigenous people learned to identify uniquely fertile soils prior to the invention of agriculture in the Amazon region, according to a University of Oregon-led team of scientists. 

Researchers have long theorized that pre-Columbian artifacts, signs of plant domestication and charcoal remains from controlled burns had produced rare spots of fertility in the notoriously highly acidic and nutrient-poor Amazon soil environment.

However, radiocarbon dating of such fertile soil, known as Amazonian dark earth, at an often-studied basin near the confluence of the Solimoes and Negro rivers in northwest Brazil tell a different story, said Lucas Silva, a professor of environmental studies, who led the project.

Full monty at the University of Oregon: Link

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